macOS 10.15 Catalina makes your Mac more powerful, safer, and easier to use. But upgrading from an older version of macOS can sometimes be a confusing and frustrating experience--especially if you're currently running a much older operating system, or if you encounter unexpected hiccups in the process. And this time, there are a few more gotchas than usual--including the elimination of support for 32-bit apps and certain other types of third-party software, additional changes to the disk structure that may affect your backups, and an unexpectedly large number of security alerts. But forewarned is forearmed, and this book guides you through everything you need to know to successfully upgrade your Mac to Catalina.